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Fair Value Measurements - Changes in balances of Level 3 financial liabilities carried at fair value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Financial liabilities, Beginning Balance |  | $ (3,541) |  | $ (2,776) | $ (2,720) |  | $ (2,542) |
Total realized/unrealized gains (losses) included in Net income |  | 70 |  | (223) | (643) |  | (286) |
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 |  | 0 | 0 |  | 0 |
Purchases and issuances |  | (63) |  | (151) | (276) |  | (395) |
Sales and settlements |  | 65 |  | 45 | 170 |  | 118 |
Transfer into Level 3 |  | 0 |  | 0 | 0 |  | 0 |
Transfer out of Level 3 |  | 0 |  | 0 | 0 |  | 0 |
Financial liabilities, Ending Balance | [1] | (3,469) |  | (3,105) | (3,469) |  | (3,105) |
Embedded derivatives |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Financial liabilities, Beginning Balance |  | (3,541) |  | (2,776) | (2,720) |  | (2,542) |
Total realized/unrealized gains (losses) included in Net income |  | 70 | [2] | (223) | (643) | [3] | (286) | [3]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 |  | 0 | 0 |  | 0 |
Purchases and issuances |  | (63) |  | (151) | (276) |  | (395) |
Sales and settlements |  | 65 |  | 45 | 170 |  | 118 |
Transfer into Level 3 |  | 0 |  | 0 | 0 |  | 0 |
Transfer out of Level 3 |  | 0 |  | 0 | 0 |  | 0 |
Financial liabilities, Ending Balance |  | $ (3,469) |  | $ (3,105) | $ (3,469) |  | $ (3,105) |
[1] | As previously discussed, these tables exclude the portion of MIE liabilities allocated to Level 3, which are derived from the fair value of the MIE assets.
[2] | Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects a favorable adjustment related to the unlocking of actuarial assumptions of $181 million in the third quarter of 2019.
[3] | Total realized/unrealized gains (losses) included in net earnings for the embedded derivatives reflects a favorable adjustment related to the unlocking of actuarial assumptions of $181 million in the first nine months of 2019 compared to a loss of $44 million in the first nine months of 2018.

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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